The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) is an experiment at Fermilab that will measure exclusive cross-sections involving neutrons produced in neutrino interactions from the Booster Neutrino Beam.
The Deep Underground Neutrino Experiment (DUNE) is currently under construction with expected start date in about 2024. Located at the Long Baseline Neutrino Facility (LBNF), the main goal is to measure the CP violation in neutrinos. In addition, DUNE is also uniquely sensitive to supernova burst neutrinos. BACoN and ACED are supporting physics experiments.
SNO+ is a 1-kton underground experiment operating at SNOLAB in Canada. It's major goals are to search for neutrinoless double beta decay, measurements of neutrino mixing parameters, supernova burst neutrinos, and a seach for baryon number violation. SNO+ went into operation in 2017.
Theia is planned as the second detector to go into the LBNF. Envisioned as a 50 kiloton
scale liquid scintillator detector with very fast optics, the main physics goals will be neutrinoless double beta decay, CP violation (complimentary to DUNE), solar and supernove burst neutrinos, diffuse supernova neutrinos, and baryon number violation. The ANNIE and WATCHMAN experiments are prototypes for Theia.
The Argon Resonant Transport Experiment (ARTIE) seeks to measure the total argon-neutron cross-section in the critical energy range of 30-70 keV, where an anti-resonance may exist that can affect the transport distance of neutrons in the DUNE far detector. ARTIE is a supporting experiment for DUNE.
The Argon Capture Experiment at DANCE (ACED) is an experiment to make the first precise measurement of the final state exclusive neutron capture cross section on argon. ACED is a supporting experiment for DUNE.
WATCHMAN is a 1-kton scale experiment under construction at the Advanced Intrumentation Testbed at the
Boulby underground laboratory in the U.K. It's main goal is to development technology for nuclear non-proliferation, but it is also an important prototype for Theia.